Making URI Scheme configurable for app url

Before Change : The app url will only use http for their communication.
After Change : The user can configure whether they want to use http or https for their communication in the integration.json file.

Issue : https://github.com/cloudfoundry-incubator/cf-smoke-tests/issues/4
Merge pull request #3 from asifhuawei/hw-issue-1

Making URI Scheme configurable for app url